<?php
class LtCacheAdapterFile implements LtCacheAdapter
{
    public function connect($hostConf)
    {
        $fileStore               = new LtStoreFile;
        $fileStore->prefix       = 'LtCache-file';
        $fileStore->useSerialize = true;
        $fileStore->init();
        return $fileStore;
    }
    public function add($key, $value, $ttl = 0, $tableName, $connectionResource)
    {
        if (0 != $ttl) {
            $ttl += time();
        }
        if (true == $connectionResource->add($this->getRealKey($tableName, $key), array(
            "ttl" => $ttl,
            "value" => $value
        ))) {
            return true;
        } else {
            if ($this->get($key, $tableName, $connectionResource)) {
                return false;
            } else {
                $this->del($key, $tableName, $connectionResource);
                return $connectionResource->add($this->getRealKey($tableName, $key), array(
                    "ttl" => $ttl,
                    "value" => $value
                ));
            }
        }
    }
    public function del($key, $tableName, $connectionResource)
    {
        return $connectionResource->del($this->getRealKey($tableName, $key));
    }
    public function get($key, $tableName, $connectionResource)
    {
        $cachedArray = $connectionResource->get($this->getRealKey($tableName, $key));
        if (is_array($cachedArray) && (0 == $cachedArray["ttl"] || $cachedArray["ttl"] > time())) {
            return $cachedArray["value"];
        } else {
            return false;
        }
    }
    public function update($key, $value, $ttl = 0, $tableName, $connectionResource)
    {
        if (0 != $ttl) {
            $ttl += time();
        }
        return $connectionResource->update($this->getRealKey($tableName, $key), array(
            "ttl" => $ttl,
            "value" => $value
        ));
    }
    protected function getRealKey($tableName, $key)
    {
        return $tableName . "-" . $key;
    }
}
